<wicket:panel xmlns:wicket="http://wicket.apache.org">
    <form wicket:id="yesNoForm" action="">
        <div wicket:id="message" align="center">Вы уверены?</div>

        <div align="center">
            <button type="submit" wicket:id="yesButton" class="abutton"><wicket:message key="label.Yes"></wicket:message></button>
            <button type="submit" wicket:id="noButton" class="abutton"><wicket:message key="label.No"></wicket:message></button>
        </div>
    </form>
</wicket:panel>